ABB Relion 670 Series Technical Reference Manual page 848

Section 13
Scheme communication
Table 461: SCCVPTOC (51) Group settings (advanced)
Name Values (Range)
tDelay 0.000 - 0.005
13.8.4.6
13.8.5
13.8.5.1
13.8.5.2
842
Unit Step
s 0.001
Technical data
Table 462: SCCVPTOC (51)technical data
Function
Operate value,
overcurrent
Reset ratio, overcurrent
Timers
Carrier receive logic LCCRPTRC (94)
Function description
Carrier receive logic
Introduction
In Direct transfer trip (DTT) scheme, the received CR signal gives the trip to the circuit
breaker after checking certain local criteria functions in order to increase the security
of the overall tripping functionality. Carrier receive logic (LCCRPTRC, 94) function
gives final trip output of the DTT scheme.
Features:
• Carrier redundancy to ensure security in DTT scheme
• Blocking function output on CR Channel Error
• Phase wise trip outputs
Principle of operation
The functionality of the Carrier receive logic (LCCRPTRC, 94) is to release the TRIP
signal for DTT scheme based on the LOCTR_A, LOCTRL_B, LOCTR_C, and
LOCTR signals coming from local criterion, and the Carrier receive signals CR! and
CR2. There are two modes of operation 1 out of 2 and 2 out of 2. In the case of the 1
out of 2 mode if any one of the carrier signal is received then the trip signals will be
Default
0.002
Range or value
(0 - 100)% of IBase
>95%
(0.000-60.000) s
IEC 61850
identification
LCCRPTRC
1MRK505222-UUS C
Description
Time delay for start and trip signals
Accuracy
± 1,0% of I
n
-
± 0.5% ± 10 ms
IEC 60617 ANSI/IEEE C37.2
identification device number
- 94
Technical reference manual